Hadoop服务端所有的客户请求(除了HTTP接口)都使用RPC框架的Server来实现.
RPC Server处理请求的是Handler线程, 对每一个请求(Call对象, 包含了客户来源IP,端口等信息)的处理过程中包含如下代码
CurCall.set(call);
其中CurCall是一个ThreadLocal对象. 在处理的过程中如果要获得客户的IP, 可以调用如下方法, RPC Server已经实现了该方法:
public static InetAddress getRemoteIp() {
Call call = CurCall.get();
if (call != null) {
return call.connection.socket.getInetAddress();
}
return null;
}
Hadoop在其他地方也用过ThreadLocal对象, 比如保存用户信息的UserGroupInformation类, 我们可以设置当前请求的UGI:
UserGroupInformation.setCurrentUGI(call.connection.ticket);
然后在Handler线程的其他地方就能得到当前用户信息:
UserGroupInformation.getCurrentUGI();
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